Building Code Calculators

Free building-code calculators for architects, engineers, and designers.

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Egress & Occupancy

Occupant Load Calculator (IBC Table 1004.5)

Calculate occupant load under IBC Table 1004.5 — select the space function, enter floor area, and get the occupant count instantly. Business 150 gross, assembly 7/15 net, classroom 20 net, and more.

Open calculator →Schedules & Specs

Equipment Schedule Builder (EQ-100)

Build an EQ-100-style equipment schedule — add equipment manually, extract from spec PDFs or product URLs, and export to Excel, PDF, or DXF. Auto-extracted fields are flagged for verification.

Open calculator →Plumbing & MEP

Grease Interceptor Sizing Calculator — HGI & GGI

Size a hydromechanical (HGI) or gravity (GGI) grease interceptor by the basin-volume method. Enter sink dimensions, get the code-minimum GPM rating or gallon capacity.

Open calculator →Egress & Occupancy

Egress Width & Exit Capacity Calculator (IBC 1005)

Calculate required egress width — occupant load times the IBC 1005 capacity factor vs. the dimensional minimum (IBC 1010/1020), returning the larger governing width, with stairway and sprinklered-reduction factors.

Open calculator →Plumbing & MEP

Plumbing Fixture Count Calculator (IBC 2902 / IPC 403.1)

Calculate required plumbing fixtures — water closets, lavatories, drinking fountains, and service sinks — from occupant load and occupancy under IBC 2902.1 and IPC Table 403.1.

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Upload a plan set and InstaPreView flags likely code issues — occupant load, egress, and more — before you submit to the AHJ.

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